I have larger rotors on mine with caliper spacers. Are you actually dissatisfied with your brake setup and performance or is this a case of newgearitis?
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Is your xr a Transformer?Give EBC a call, they might have 320mm rotors. Also see what Speedking cycles have. I have seen a bunch of 320mm rotors on Harleys and the XR rotors are used pretty much across the HD line up, so the bolt pattern should be the same.